687561055199 has 2 divisors, whose sum is σ = 687561055200. Its totient is φ = 687561055198.

The previous prime is 687561055193. The next prime is 687561055211. The reversal of 687561055199 is 991550165786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687561055199 - 2¹² = 687561051103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687561055193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343780527599 + 343780527600.

It is an arithmetic number, because the mean of its divisors is an integer number (343780527600).

Almost surely, 2^687561055199 is an apocalyptic number.

687561055199 is a deficient number, since it is larger than the sum of its proper divisors (1).

687561055199 is an equidigital number, since it uses as much as digits as its factorization.

687561055199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20412000, while the sum is 62.

The spelling of 687561055199 in words is "six hundred eighty-seven billion, five hundred sixty-one million, fifty-five thousand, one hundred ninety-nine".